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141. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Mon Mar 24 10:27:39 2003; ** This has been my experience too. ** VHF-resonance related hv-rf-choke fires are seen mainly in Henry Radio 2, 3-500Z amplifiers such as the 3K-A, 2K-4, 2K-3 ... ... . A resonance near 95MHz appea; /archives//html/Amps/2003-03/msg00810.html (9,203 bytes)
142. [Amps] 833A in linear for SSB (score: 127): Author: 2 at vc.net (2); Date: Mon Mar 24 05:39:29 2003; To produce a reasonable power level as a grid-driven linear, a triode needs a Mu of c. 3 max. To do this in g-g, Mu needs to be 100 min. This is why tetrodes are usually more suitable for grid-driven; /archives//html/Amps/2003-03/msg00808.html (8,881 bytes)
143. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Mon Mar 24 05:39:10 2003; and fires. ** a burned-band near the middle of a choke is usually from a vhf parasite. than the ** measuring the resistance of R-sup is a clue. cheers, Phil - R. L. Measures, a.k.a. Rich..., 805.386; /archives//html/Amps/2003-03/msg00807.html (8,940 bytes)
144. [Amps] 833A in linear for SSB (score: 127): Author: 2 at vc.net (2); Date: Sun Mar 23 14:28:43 2003; ** The sticky wicket is that the Mu of an 833 is a bit low. Thus, to drive one takes a bunch. ** 5-813s sounds good. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00797.html (8,527 bytes)
145. [Amps] Re: COLLINS Engineering (score: 127): Author: 2 at vc.net (2); Date: Sun Mar 23 13:02:20 2003; ** unless you are the contractor for the Osprey project. As i recall, there was an Army radar-controlled anti-aircraft gun that sucked up a couple of $Gigadollars before taxpayers found out the Russ; /archives//html/Amps/2003-03/msg00794.html (8,197 bytes)
146. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Sun Mar 23 10:45:34 2003; ** who said there was a R/L suppressor in the 30S-1 ? ** I was unable to confirm Vern Baumgartner's (W6HW) statement about the 30S-1, which is why I omitted it from the January, 1994 QST article. Ho; /archives//html/Amps/2003-03/msg00791.html (10,820 bytes)
147. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Sun Mar 23 05:30:49 2003; that But ** adding new bands or adding 160m has no effect on a HF amp's vhf anode resonance and on its vhf gain. ** More anode V undoubtedly means more gain. ** More compact layouts would seemingly; /archives//html/Amps/2003-03/msg00785.html (9,790 bytes)
148. [Amps] FL2100 572B Failure Mode (score: 127): Author: 2 at vc.net (2); Date: Sat Mar 22 19:58:08 2003; ** A melted hole seems unlikely to have been caused by too much grid current. My wild and crazy guess is that the filament may have touched the grid where the hole is burned, each ** Burned usually; /archives//html/Amps/2003-03/msg00782.html (7,686 bytes)
149. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Sat Mar 22 17:08:03 2003; ** Vern Baumgartner, a friend who worked as an engineer at Collins Radio told me that Ni-Cr alloy was used as a conductor in the 4cx1000A's anode circuit. ** I've never heard of a 30S-1 exhibiting a; /archives//html/Amps/2003-03/msg00778.html (9,290 bytes)
150. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Sat Mar 22 15:59:06 2003; ** Only when generously supplied with the essential material. ** That Mr. Rauch's utterances on parasitic suppression do not hold water. Playing the Sarcasm Card without taking bearings carries risk; /archives//html/Amps/2003-03/msg00775.html (11,709 bytes)
151. [Amps] SB220 Improvements (score: 127): Author: 2 at vc.net (2); Date: Sat Mar 22 10:07:19 2003; 1500pF minimum will protect the grid fusing R from RF. Also, the 220 needs: 1. a 10-ohm 10W glitch resistor in series with the +hv line prior th the HV-RFC. 2. glitch diodes to protect the meter move; /archives//html/Amps/2003-03/msg00770.html (7,327 bytes)
152. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Sat Mar 22 04:25:55 2003; ** ______ - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00769.html (8,079 bytes)
153. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Fri Mar 21 22:18:55 2003; sour grapes? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00767.html (7,691 bytes)
154. [Amps] Current Limiting Filaments (score: 127): Author: 2 at vc.net (2); Date: Fri Mar 21 21:44:28 2003; ** I measured the filament inrush current on a SB-220 at 60% of what Eimac recommends as max. (29A) The SB-220 uses a current-limiting type filament transformer. - R. L. Measures, a.k.a. Rich..., 80; /archives//html/Amps/2003-03/msg00765.html (7,809 bytes)
155. [Amps] Problems with 3cx3000 amp (score: 127): Author: 2 at vc.net (2); Date: Fri Mar 21 14:52:12 2003; ** The only way to check a vacuum cap is with a high-pot tester. ** 1000pF is not much of a bypass below about 10MHz. If you are interested in building a resistor-less vhf suppressor that other 3cx3; /archives//html/Amps/2003-03/msg00759.html (8,860 bytes)
156. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (2); Date: Fri Mar 21 07:07:11 2003; Rich replied: "** Not in my copy of "Care and Feeding ..." Rich, it is in my copy. Page 68 of the third printing,1978, under 4.3.2 What Makes a Tube Linear. Seems to me that was one of the points of; /archives//html/Amps/2003-03/msg00753.html (8,016 bytes)
157. [Amps] Hard-drive Dive (score: 127): Author: 2 at vc.net (2); Date: Fri Mar 21 06:32:13 2003; For those who ordered a Low VHF-Q parasitic suppressor retrofit kit from me this week: The orders I entered in the computer this week were lost when the hard drive went kaput on 20-March. If you orde; /archives//html/Amps/2003-03/msg00752.html (7,393 bytes)
158. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 20 12:45:27 2003; ** How many watts of drive is needed to produce 550mA of I-plate/anode? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00739.html (8,771 bytes)
159. Fwd: Re: [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (rlm); Date: Wed Mar 19 21:46:17 2003; ** Except for the bandswitch. ** When a single 3-500Z is driven by 100w, IMD is not good. ** In analytic geometry, one learns that when the slope of a straight line begins changing, a curve results.; /archives//html/Amps/2003-03/msg00721.html (9,312 bytes)
160. [Amps] TL922A and AL80A (score: 127): Author: 2 at vc.net (rlm); Date: Wed Mar 19 21:38:13 2003; ** When a single 3-500Z is driven by 100w, IMD is not good. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00720.html (9,747 bytes)

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